# R2 GearCalc — Gearing calculator

> Gearing calculator (iPhone/iPad app by Yury Rak.)

- Source: https://appshunter.io/ios/app/r2-gearcalc/id6797484645 (this page in markdown: same URL + `.md`)
- Developer: [Yury Rak](https://appshunter.io/developer/6796796988)
- Category: Utilities, Sports
- Price: Free
- Age rating: 4+
- Requires: iOS 16.4 · 45 MB
- Languages: American English
- Released: 2026-08-31
- Data updated: 2026-09-16
- User reviews in markdown: https://appshunter.io/ios/app/r2-gearcalc/id6797484645/reviews.md

## What is R2 GearCalc?

Gear ratio calculator for drift and race cars.

Pick your gearbox, final drive and tire size and instantly see:

• wheel speed in every gear at your shift RPM
• RPM drop on every upshift
• a clear RPM vs speed sawtooth chart
• speed per 1000 RPM for every gear

WINTERS QUICK CHANGE BUILT IN
The full Winters Performance 8500-series 10-spline gear chart is included: 67 spur gear sets with 4.12, 4.57 and 4.86 ring & pinion options. Ratios are computed from exact tooth counts. Star the sets you own to build your inventory and swap between them in one tap to compare setups.

269 GEARBOX PRESETS
Factory ratio presets from popular manual and automatic transmissions (ZF GS6-53DZ selected by default), or enter a manual final drive ratio for any other setup.

TIRE SIZE YOUR WAY
Enter the outside diameter in millimeters or a metric size like 225/45R17, with common presets one tap away.

BUILT FOR THE TRACK
High-contrast dark interface with bright accents that stays readable in direct sunlight. No account, no ads, no data collection — everything stays on your device and works offline.


## Version history (last 1 release)

### 1.0 — 2026-08-31

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-16.*